Controller.



PATENTED JULY 7, 1908.

E. W. STULL.

CONTROLLER.

APPLICATION FILED JUNE so, 1906.

Emmefl WSlull ATTORNEY INVENTOF WITNESSES EMMETT W. STULL, OF NORWOQD, OHIO, ASSIGNOR TO ALLIS-GHALMERS COMPANY, A (103- POBATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURING COMPANY.

A CORPORATION OF OHIO.

coarseness.

Patented July 7, 1808.

Application filed June so, recs. filerial Ho. scenes.

To all whom it may concern:

Be it known that l, EMMETT W. STULL,

citizen of the United States, residing at Nortion;

My invention relates to controllers for "electric motors, and especially to arrangements for preventing flashlng at the contacts of railway controllers.

lt frequently happens, especially when the car is-being notched along, that dangerous arcing or flashing occurs at the controller contacts when the'controller is moved to oil positlon. Sometimes this arcing will .burn

'outfth'econtroller and absolutely disable the can i lit is the object of my invention to entirely avoid flashing at the controller contacts and to break the motor circuit elsewhere.

ln one aspect my invention comprises the combination with a motor controller, of a magnetically o erated switch arranged to be opened when t e controller is moved back ward into its first operative position.

In a more specific aspect my invention comprises the combination of a motor controller, a-magnetically operated switch biased toward closed position and normally locked in such position, a magnet which. unlocks said switch when the controller is in its second operative position, and a second magnet which tends to open said switch when the controller is in the first operative position.

Other objects and features of my invention will appear hereinafter,

The single figure of the drawing shows diagrammatically one embodiment of my invention;.--

- The controller shown in this figure may be of any desired type, but is here shown as a seriesparallel controller for two electric motors A and B. The controller drum 15 has operative positions 1 to 13 inclusive and is provided with contact segments cooperating with stationary contact fingers 16 to 28 in- As the controller is moved between tor circuit is varied with the motors connccted in series. Between positions 8 and 9, the'connections of the motors are changed from series to parallel. Between positions 9 and 13 the resistance It is varied with the motors connected in parallel.

The contact finger 16 is connected to the movable member 29 of a magnetically operated switch S. The stationary member 30 of this switch is connected to the trolley or other collecting device 31 through a blowout coil 32.. The movable member 29 is pivoted at 38, is biased toward engagement'with the stationary member 30 by a spring 33, and is normally locked in such osit1on by a springp'ressed latch 34. The atch 3 l'is moved to unlock the movable member 2% when a mag net 35 is energized, this magnet being con' nected in series between contact finger 18 and the resistance R. There is another magnet 36 of the solenoid type which is connected in series between contact finger 17 and resistance R. The solenoid 36 tends to 0 en the switch S whenever it is energized, ut can only do so if the movable member 29 of said switch is not locked by the latch 34. The switch S is normally closed. Adash- 0t or other time-limit device 37 retards the c osing movement of said switch, but allows a free opening movement thereof.

The operation of my invention is as follows: When the controller is moved into its first operative position the motor circuit is completed from trolley 31, through blowout coil 32, switch S, contact finger 16, the proper contacts of the controlling drum, contact finger 17, solenoid 36,-the whole of resistance B, and the motors A and B to' ground. In this position the solenoid 36 tends to open the switch S but is prev eife d from doing so by the latch 34. When the controller is moved into its second operative position, the solenoid 36 and the lowest section of resistance R are shunted by the engagement of contact finger 18 and its co- 0 crating contact segment .on the drum.

his com letes a circuit through magnet 35 which wil move the latch 34 to unlock the movable member 29 of the switch S. ever, the switch although unlocked doesnot open, because the solenoid 36 is short-circuited at this time. The further forward movement of the controller denergizes'magnet 35 and varies the motor circuits in any desired manner, but this latter having nothing to do with my not be described in etail. When the controller in its backward movement reaches Howi resent invention Will r so position. 2, themegnet 35 is energized to move latch. 34 tounloclt the movable member 29 of switch 55-. Upon further backward movement to position 1, the solenoid 36 is crg'ized, and the switch now being un- )GlLZQCl, the movable member 29 thereof is moved by the solenoid 36 to open the motor it at the contacts 29 and 30. An arcing which takes place at these contacts is on izuished by. the blowout magnet 0.4.. Upon the final backward movement of the co itroller to oil position. no arcing takes place at the controller contacts because motor LET Cull; is already broken. in order to allow the motorman sui'licient time to move the controller from first to,oll" position, the closing movement ol theswitch s is retarded by the dash-pot 37, the opening movement of the switch being unretarded. The switch at which the motor eircui t is broken me; be located at any :ilesired place, but is l'IFGfGltl'JlY so located as to he out of sight of the passengers. in some controll the motor circuit moves between series and lirst pan allel positions. [is the motors usually have considerable: eonntenelectromotive force this time, thus gt' otly reducing the spa-rhin which would taiie place at the cont oller, it

is generally unnecessary to provide tor-haw ling circuit broken elsewhere than at the controller contacts when this change is made. l-lowever, by a slight rearrangement of the parts this can he done desired.

Many modifications of the particular system of connections herein. set forth be made without departing from the spirit and scope of my invention, and all these obvious modifications aim to cover in the appended claims.

What I claim as new is z in combination, a motor controller, and a magnetically operated switch through which the motor current is always suoplied, said switch being so connected and a nged that it is opened when the controller is moved backward into its first operative position.

2. In combination, a motor controller, a magnetically operated switch, and connections between the switch and the controller so arranged that the switch opened when the controller is moved backward to its first operative position but is unmoved when the controller reaches such position in its forward movement.

In combination, a k'zontroller for electric motors, a normally closed switch in series with the controller, and a magnet arranged to open said switch when the controller in its backward movement reaches its in'st operative position.

4; ln. combination, a motor contro ler, switch biased toward closed posi" series with the controller, and a magnet for opening said switch. when the controller is moved backward through its first operative 1'. in combination, a motor cmitrollcr, a

normally closed switch. in series therewith,

magnet an'angec to open said switch when the controller is moved backward through its first operative position, means tending to close said switch, and means for retarding such closing.

53. .In combination, motor controller, a normally closed switch in series. therewith, a spring latch for normally locking said switch in closed position, a magnet energized when the controller is in its second operative position to release said latch, and a second 11mgnct energized when the controller is in its first o eretive eosition tendin to o )611 sai switch. I

9. ln combination, a motor controller, a

normally closed switch in series therewith, a

spring latch for normally locking said switch in closed position,- a magnet energized when the controlleris in its second operative position to release said latch, and a second magnet encr ized when the controller is in its first operative position tend lg to open said switch, said magnets losing in s ries wit 1 the controller.

1.0. combination, a motor controller, normally closed switch in series therewith, spring latch for normally locking said in closed position, a magnet *zed when the controller is in its second onerat.. ve po tion to release .said latch, a second n at energized when the controller is in i erative positioi'i tending to open s." and means tending to close said switch.

ll. In. combination, a motor controller, a normally closed switch in series therewith, a spring latch for normally locking said switch in closed position, magnet energized when the controller is in its second operative posi tion to release said latch, second magnet energized when the controller in its 'li ooerative position tending to open said switch, means tending to close said switch, and

dash-pot l'or retarding such closing.

12. In combination a inotcr controller, an electrically operated snitch position and permanently in plete', and connections whereby said switch.

seatsi controller Whenever the motor circuit is comis opened when the controller reaches a predetermined position in its backward movement.

13. In combination, a motor controller, a normally closed switch in series therewith, means for locking said switch in closed position, a magnet which unlocks said switch when the controller is in a predetermined position, and a second magnet which tends to open said switch when the controller is in another predetermined position.

14. In combination, a motor controller, a switch in series therewith, and magnets arranged to open said switch when ener ized in a certain order, and connections to t e con troller whereby said magnets are energized in said order during the movement of the controller in one direction, but in another or- ,der during the movement of a controller in the other direction. e

15. In combination, a motor controller, an electrically operated switch through which the full motor current is supplied when the controller is in a certain o erative-position, and connections whereby tli e motor circuit is always-made at the controller but is broken at the switch when the controller in its backward movement reaches such position.

In testimony whereof I alfix my signature, in the presence of two witnesses.

EMMETT W. S'IULL. Witnessesi Geo. B. SoHLEY,

FRED J. Kmssr. 

